Update welcome.md
Update welcome.md

Minor rewording to optimize for Spanish auto-translation.  Credit for Spanish translation input belongs to https://steemit.com/@latino.romano
steemit/steemit.com,TimCliff/steemit.com,TimCliff/steemit.com,TimCliff/steemit.com,steemit/steemit.com,steemit/steemit.com